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They are used to plot all kind of data against time in a very easy way which is why they are used a lot in all kind of applications.Even though many consider RRD as a library to create graphs, it is actually more than that: it’s a complete system to store aggregated data in a very efficient way. It is a database for collecting all kinds of data against time.

Set up alerts to notify you when potential threats arise, or simply query your log data to quickly audit any system.This means that RRD database files will never grow in size.Every RRD works with a “step rate”, which tells us how far the data points are located from each other.Nagios is helping organizations around the world make better business decisions with proven IT infrastructure monitoring, data collection, and netflow analysis solutions.You may not be familiar with the term RRD graph, but if I show you one, you probably recognize them instantaneously.

Before we can do something useful with RRD, we need to install the RRD extension. The RPMForge repository provides a php5-rrdtool package which you can install with “yum install php5-rrdtool”.

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